- 1 year ago
How to change which version of Java to use in Jupyter Notebook
To change the version of Java used in Jupyter Notebook, you need to update the Java kernel configuration. Here's a step-by-step guide:
Ensure you have multiple versions of Java installed on your system. You can check the installed versions by running
java -version
in the command prompt or terminal.Install the Jupyter Notebook if you haven't already. You can use the command
pip install jupyter
to install it.Install the Java kernel for Jupyter Notebook. There are different Java kernels available, such as IJava or BeakerX. Install the kernel of your choice by following the instructions specific to that kernel.
Configure the Java kernel to use the desired Java version. This step may vary depending on the Java kernel you installed. Here's an example for configuring the IJava kernel:
- Open a command prompt or terminal.
- Run the following command to generate a default kernel configuration file for IJava:
python -m jupyter java-kernel install
- Locate the generated
kernel.json
file. The file should be located in the Jupyter kernels directory, typically in~/.local/share/jupyter/kernels/ijava/kernel.json
on Linux or%APPDATA%\jupyter\kernels\ijava\kernel.json
on Windows. - Open the
kernel.json
file in a text editor. - Look for the
"env"
section in the file and add the desiredJAVA_HOME
environment variable with the path to the Java version you want to use. For example:json"env": {
"JAVA_HOME": "/path/to/java"
}
- Save the
kernel.json
file.
Restart or launch Jupyter Notebook. You can do this by running the command
jupyter notebook
in the command prompt or terminal.In Jupyter Notebook, select the Java kernel you configured. You should see the configured Java kernel as an option when creating a new notebook or changing the kernel for an existing notebook.
By updating the Java kernel configuration, you can specify the desired Java version to be used in Jupyter Notebook. Make sure to provide the correct path to the Java version you want to use in the "JAVA_HOME"
environment variable.
Please note that the steps provided here are for illustrative purposes and may vary depending on the specific Java kernel you are using. Refer to the documentation of the Java kernel you installed for detailed instructions on configuring the Java version.